Baltimore Police Officer William Porter as he arrived to court in Baltimore for his own trial in the Freddie Gray case Dec. 16, 2015. Porter, one of six Baltimore police officers charged in Gray’s death, testified June 13, 2016, in the trial of fellow Police Officer Caesar Goodson regarding Gray’s death.Mark Wilson/Getty Images

One of the Baltimore police officers facing charges in the death of Freddie Gray testified Monday that Gray had asked for help while being transported in a police van where he suffered a fatal neck injury, Reuters reports.

Police Officer William Porter spoke at the trial of Police Officer Caesar Goodson Jr., who, as the van’s driver, is facing the most serious charge in the death of the 25-year-old Gray. Prosecutors accuse Goodson of giving Gray a “rough ride,” and he is facing multiple charges in the death, including second-degree depraved-heart murder.

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According to the report, Porter testified that he responded to a call to help Goodson after the van stopped for the fourth time while transporting Gray. Porter testified that he found Gray, who was shackled, lying on his stomach on the van’s floor, his head facing the front of the vehicle.